Sunny had not known what to expect from the Tomb of Ariel — the real Tomb of Ariel, not the phantom of it conjured by the Nightmare Spell — but he at least knew what not to expect, which allowed him to make some predictions.
First and foremost, the difference between the real Great River and the Great River he encountered in the Third Nightmare was the role Daeron the Serpent King had played in the fate of the River People.
Daeron had made it across the white sands of the Hell of Ariel and entered Ariel's Tomb in the company of his strongest champions — those like his daughter, Wind Flower. By doing so, they left an imprint of themselves on the Great River, which meant that a version of them would exist in all Nightmares that took place there.
